<template>
  <div class="app">
    <h3>我是App组件（祖），{{name}} --- {{ price }}</h3>
    <Child />
  </div>
</template>

<script>
import { reactive, toRefs, provide } from 'vue'
import Child from './components/Child.vue';


export default {
  name: 'App',
  components: {Child},
  setup() {
    let car = reactive({
      name: "奔驰",
      price: "40W"
    })

    provide('car', car)
    return {
      ...toRefs(car)
    }
  }
}
</script>

<style>
.app {
  padding: 10px;
  background-color: gray;
}
</style>
